The Tropic of Cancer is the farthest north you can go and still see the Sun directly overhead. This happens at the June solstice. There's an interesting monument in Taiwan to the Tropic of Cancer. Prize-winning astrophotographer
Rogelio Bernal Andreo has taken a beautiful picture of it . The structure is actually all white, but in this picture one side is colored orange by city lights. That side is just south of the Tropic of Cancer and the other side is just north.
A few thousand years ago the Sun was in the constellation Cancer at the June solstice, then in Gemini, and now in Taurus.